Lecture 8 micromouse pcb design guide
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Lecture 8 Micromouse PCB design guide. Components Placement. Place library for encoder/motor to (0,0) to make it symmetrical from left and right Draw a middle reference line. Use dimension layer to draw the outline of the mouse, make sure the length is not exceed 100mm to save cost.

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Lecture 8 Micromouse PCB design guide

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Lecture 8 micromouse pcb design guide

Lecture 8Micromouse PCB design guide


Components placement

Components Placement


Lecture 8 micromouse pcb design guide

  • Place library for encoder/motor to (0,0) to make it symmetrical from left and right

  • Draw a middle reference line


Lecture 8 micromouse pcb design guide

  • Use dimension layer to draw the outline of the mouse, make sure the length is not exceed 100mm to save cost


Lecture 8 micromouse pcb design guide

  • Draw the guide line for the wall and posts in order to determine the sensor point angles later


Lecture 8 micromouse pcb design guide

  • Place the components at proper position

  • Place sensors at proper position, make sure they point to proper location

  • Make sure the components won’t be blocked by motor mount/encoder


Where should sensors point to

Where should sensors point to?

  • Side sensors point to somewhere a little to the front of the post, when the mouse is at the center of the cell

  • Front sensors point outwards about 5-10 degrees, make so it won’t point to the side of the wall when at 1.5 cells away


Pcb drawing

PCB drawing


Settings

Settings

  • No mask for via>12 mills

  • Make 1 mill grid when drawing and parts placing


Traces

Traces

  • MCU pins from LQFP package are 10-12 mill wide.

  • Try maximum tracer width for power/analog signal related trace

  • Thinner traces are OK for digital signal


Trace thickness

Trace thickness

  • Wider trace for high power intensive parts, ex. Vbat Power trace

  • Thinner for signal traces

  • Polygon may needed to give more area for power trace for thermo performance


Trace style

Trace style

  • Shorter the possible

  • Less turn possible

  • 45 degree turns

  • good

  • bad


Small via

Small via

  • 12 mill via minimum

  • Good for signal trace

  • Better be masked


Large via

Large Via

  • Larger via for power/thermo intensive trace/pad/polygon

  • Should not be masked

  • Drill shouldn’t bee too big


Polygon

Polygon

  • First to the First: Don’t make a single GND polygon for the entire PCB!!!!!

  • Why? Because it will transfer heat to temperature sensitive components easily from some heat intensive parts

  • You should place polygon selectively, only on those parts generate a lot of heat(5V LDO, motor driver) or the parts are sensitive with heat(MCU, analog device)


Sample 1

Sample 1

  • Motor driver, GND polygon, on both sides


Sample 2

Sample 2

  • Not make the polygon connected between 5V and MCU since MCU is temperature sensitive


Distincted ground

Distincted Ground

  • MGND

  • DGND

  • AGND

  • Don’t mix them before they reach the negative terminal of battery

  • AGND is temperature sensitive, make the trace avoid the hot area if possible


Lecture 8 micromouse pcb design guide

MGND


Lecture 8 micromouse pcb design guide

DGND


Lecture 8 micromouse pcb design guide

AGND


Questions

Questions?


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